55140588 has 144 divisors (see below), whose sum is σ = 158505984. Its totient is φ = 16692480.

The previous prime is 55140583. The next prime is 55140601. The reversal of 55140588 is 88504155.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55140581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 776593 + ... + 776663.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^55140588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55140588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79252992).

55140588 is an abundant number, since it is smaller than the sum of its proper divisors (103365396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55140588 is a wasteful number, since it uses less digits than its factorization.

55140588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 55140588 is about 7425.6708787826. The cubic root of 55140588 is about 380.6190003665.

The spelling of 55140588 in words is "fifty-five million, one hundred forty thousand, five hundred eighty-eight".